Handheld controller



FIG. 1 is a perspective view of a handheld controller showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a second perspective view showing the handheld controller.

The broken lines in the drawings illustrate portions of the handheld controller that form no part of the claimed design. 

CLAIM The ornamental design for a handheld controller, as shown and described. 